JPH0651308A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a small-sized, thin and durable liquid crystal display device which is easy to assemble. CONSTITUTION:A liquid crystal cell 1 and an illuminating means 2 are laminated, and at least either of them is supported by a frame 3. The illuminating means 2 includes a light transmission plate 21 and a linear light source 22 arranged on the side surface of the plate 21. When the light source 22 is supported by the frame 3, a fixing means 5 is used, which is provided with a frame part 51 fixing the light source 22 so that the longitudinal direction of the light source 22 may be arranged in parallel with the side surface of the frame 3 and a crane wing part 55 integrated with the frame part 51 so that it can be bent and fixed to the frame 3 on the back surface side of the light source 22. The supporting frame 3 is constituted of resin molded goods obtained by vacuum molding or resin molded goods obtained by foaming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a liquid crystal cell and a lighting means.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device, as shown in Japanese Patent Laid-Open No. 3-194515, a liquid crystal cell and an illuminating means composed of a light guide plate and a light source arranged on the back surface of the liquid crystal cell are framed. A so-called module has been constructed by supporting the body using a body, and by using a box-shaped frame body such as a front frame and a back cover from the front and the back to store them. At this time, both ends of the light source of the illuminating means are fixed to the support frame and are housed in the front frame or the back cover so as to face the side surface of the light guide plate with a predetermined distance. Also, the support frame is made of a resin molded product,
Predetermined strength is required in order to support the component parts and to be used as the core material of the display device.
Therefore, it has been obtained by injection molding.

[0003]

However, since the liquid crystal cell is a glass product, the idea is to protect the liquid crystal cell. Since the liquid crystal cell uses plate glass, relatively strong strength can be obtained. Since it tends to be used as a material, and the liquid crystal display device needs to be thinned in order to reduce the size and thickness of the device, the box-shaped frame body (back cover) on the back is unnecessary, and We have devised the mutual arrangement and support method so that strength is required only for the part that fixes the components. As a result, the supporting frame has changed its function from the function as a core material of the device to the one required to keep a constant gap between the parts, so that the glass products arranged around the components, especially the display device. The support and protection of the barrel light source are insufficient, and if the periphery of this light source is housed in a cylinder, only the light source portion becomes thick and it is difficult to assemble, which is not preferable.

Further, since the frame body whose function has been changed in this way is not thin and heavy, it hinders the reduction in size and weight of the module.

[0005]

The present invention has been made in consideration of the above points. First, when a light source is supported on a frame, the longitudinal direction of the light source is set parallel to the side surface of the frame. The light source is fixed to the frame body by using fixing means having a frame portion for fixing the light source so as to be arranged and a crane wing portion which is foldably integrated with the frame portion and covers the back side of the light source.

In the second aspect of the present invention, the frame supporting at least one of the liquid crystal cell and the illuminating means is constituted by a vacuum molded resin molded product or a foam molded resin molded product.

[0007]

As described above, in supporting the light source, the light source can be first supported by the frame portion, and then the open portion on the back surface of the light source can be covered with the crane wing portion. If the frame is made of vacuum-molded resin, the thickness can be reduced, and if it is foam-molded, the weight is light.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of an essential part of a liquid crystal display device according to an embodiment of the present invention. Reference numeral 1 is, for example, a twist nematic type or super twist nematic type liquid crystal cell. There is. Reference numeral 2 denotes an illuminating unit arranged on the back surface of the liquid crystal cell 1, which includes a light guide plate 21 made of a transparent acrylic resin flat plate and the like, and a linear light source 22 arranged on a side surface of the light guide plate 21. Light guide plate 21
Has a diffusion sheet on the front and a reflection sheet on the back,
Alternatively, reflective dots or diffusing particles as light diffusing means are arranged inside. Further, the light source 22 is composed of a cold cathode tube or a fluorescent tube, and a reflection sheet is wound around it in a non-contact manner as necessary, and guides light efficiently to the side surface of the light guide plate.

Reference numeral 3 denotes a frame body for supporting at least the liquid crystal cell 1 or the illuminating means 2, which is made of a resin molded product. For example, a tongue piece is arranged in the peripheral portion of a through hole provided at the center to fit and support the light guide plate 21. Then, the liquid crystal cell 1 is supported while a gap is secured between the liquid crystal cell 1 and the light guide plate 21 by the protrusion provided near the central through hole. Reference numeral 4 denotes a front frame which covers the peripheral portion of the front surface of the liquid crystal cell 1, which is made of a metal plate molding or the like, has a through hole for exposing the effective display surface of the liquid crystal cell 1, and is fixed to the frame body 3 with screws or the like. It

Reference numeral 5 denotes a fixing means for supporting the light source 22 and fixing it to the frame body 3, which is made of an aluminum plate or the like and also serves as a so-called lamp house. The longitudinal direction of the light source 22 is parallel to the side surface of the frame body 3. It has a frame portion 51 for fixing the light source 22 so as to be arranged, and a crane wing portion 55 which is foldably integrated with the frame portion 51 and covers the back side of the light source 22. More specifically, referring to FIG. 2, the frame portion 51 has a substantially L-shaped rail shape so as to cover the light source, and one side of the side where the crane wings 55 are not connected is the frame body 3. A holding portion 52, which is fixed from the front surface side, is formed in the vicinity of the fixed side to support the light source 22 in parallel with the fixed side. On the other hand, the crane wing portion 55 is connected to the frame portion 51 at the center, and the connecting portion is thin and narrow so that it can be bent. Therefore, the light source 22 is fixed before the crane wings 55 are bent, the frame 51 is fixed to the frame 3, and then the crane wings 55 are fixed to the light guide plate or the frame from the back side. . When fixed, the fixing means 2 has a lateral U-shape. Therefore, the thickness of the light source portion can be made thin because it does not exceed the thickness of the frame body or the thickness of the frame body and the light guide plate, and the back surface of the light source storage portion is opened by the fixing means to support the light source, which improves workability. Also, the crane wing part 55 is thin and narrow so that the part integrated with the frame part 51 can be easily bent, and since it is provided in the substantially central part in the longitudinal direction, the fixing means 5 after fixing the crane wing part 55 is Becoming robust,
It is possible to protect the light emitting portion (glass tube portion) of the light source 22 supported in the hollow from external impact.

The above-mentioned frame 3 can be obtained by conventional injection molding, but if the wall thickness is made thinner than 2 to 3 mm, so-called resin short circuit occurs. Therefore, a frame 35 as shown in FIG. 3 is formed by a vacuum system manufacturing method such as a slate method, a drape method, a snapback method, and a plug assist method. As a result, a thin resin can be molded, the weight of the display device can be reduced, the amount of resin used is small, and the die cost is low, so that the display device is inexpensive. Further, the thickness of the display device is almost as thin as possible due to the thickness restrictions of the front frame 4, the liquid crystal cell 1, and the light guide plate 21, and when the thinning of only the frame 3 has little effect, the frame is foamed. It may be formed by molding. As a result, although the rigidity cannot be obtained, the weight of the frame having the same mass can be reduced by about 10%.

[0012]

As described above, in assembling the light source, the light source is first supported by the frame portion and fixed to the body to be boiled, and then the open portion on the back surface of the light source can be covered with the crane wing portion. Moreover, since the light source is covered with the U-shaped fixing means in a non-contact manner after being fixed, the light source does not need an unnecessary thickness larger than the thickness of the light guide plate or the boiling body, and is small and robust. If the frame is made of vacuum-molded resin, the thickness can be reduced, and if it is foam-molded, the weight is light.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a fixing means according to the present invention.

FIG. 3 is a cross-sectional view of essential parts of a liquid crystal display device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal cell 2 Illuminating means 21 Light guide plate 22 Light source 3 Frame 4 Front frame 5 Fixing means 51 Frame part 55 Crane wing part

Claims (2)

[Claims] 1. A frame body for supporting a light guide plate arranged on the back surface of a liquid crystal cell, a linear light source arranged on a side surface of the light guide plate, and a fixing means for supporting the light source and being fixed to the frame body. The fixing means includes a frame portion for fixing the light source such that the longitudinal direction of the light source is arranged substantially parallel to the side surface of the frame body, and the fixing portion is foldably integrated with the frame portion and covers the back surface of the light source. A liquid crystal display device having a crane wing section. 2. A liquid crystal cell, an illuminating means arranged on the back surface of the liquid crystal cell, a frame body that supports at least one of the liquid crystal cell and the illuminating means, and a front frame that covers the front surface of the liquid crystal cell, The liquid crystal display device, wherein the frame is made of a vacuum-molded resin molded product or a foam-molded resin molded product.